To seek something where it cannot possibly be found; to pursue an objective in vain by looking in the wrong place or for something nonexistent.
如果想提升技能，却只专注于理论研究而不实践，这无异于求马于唐肆，难以有实质性进展。
If you want to improve your skills but only focus on theoretical research without practice, it's like seeking a horse in an empty market, making it difficult to achieve substantial progress.
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